The testing snafu explained

The issue threatening to torpedo the Manny Pacquiao-Floyd Mayweather welterweight superfight is the Mayweather Camp’s insistence on Olympic-style drug testing as opposed the normal drug testing procedures used by the Nevada State Athletic Commission, which consists of a urine test immediately before and after the fight. Olympic style testing requires multiple random drug tests. The fighters can be expected to experience eight to ten random urine tests and five to six random blood tests in the ten weeks leading up to the fight. The Mayweather Camp has alleged that Pacquiao is taking illegal substances, although Pacman has never previously failed a drug test. The Pacquiao Camp has agreed to take a blood test before the kickoff press conference and after the fight, but the Mayweather Camp is standing firm that the random Olympic testing is non-negotiable.

Should the parties work out their differences, the fight will land on March 13 at the MGM Grand in Las Vegas. The Mayweather Camp has agreed to a $10 million penalty per pound or fraction thereof if either fighter comes in overweight.